Practice Questions

Q66.When sec-butylcyclohexane reacts with bromine in the presence of sunlight, the major product is : (1) (2) (3) (4)

Q67.The successive 5 ionisation energies of an element are 800, 2427, 3658, 25024 and 32824 kJ/mol, respectively. By using the above values predict the group in which the above element is present : (1) Group 13 (2) Group 14 (3) Group 2 (4) Group 4 2025 (24 Jan Shift 2) JEE Main Previous Year Paper

Q67.For the given cell Fe2+ (aq) + Ag+ (aq) →Fe3+(aq) + Ag(s) The standard cell potential of the above reaction is Ag+ + e−→Ag Eθ = xV Given: Fe2+ + 2e−→Fe Eθ = yV Fe3+ + 3e−→Fe Eθ = zV (1) x + y −z (2) x + 2y (3) x + 2y −3z (4) y −2x

Q67. The IUPAC name of the following compound is : (1) Methyl-6-carboxy-2,5-dimethylhexanoate. (2) 2-Carboxy-5-methoxycarbonylhexane. (3) 6-Methoxycarbonyl-2,5-dimethylhexanoic acid. (4) Methyl-5-carboxy-2-methylhexanoate.

Q67. An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by tracing the path A →B →C →D →A as shown in the three cases above. Choose the correct option regarding ΔU : (1) ΔU( Case-I ) = ΔU( Case-II ) = ΔU( Case-III (2) ΔU( Case-I ) > ΔU( Case-III ) > ΔU( Case-II ) ) (3) ΔU( Case-III ) > ΔU( Case-II ) > ΔU( Case-I (4) ΔU( Case-I ) > ΔU( Case-II ) > ΔU( Case-III ) )

Q67.The most stable carbocation from the following is : 2025 (22 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q67.Given below are two statements : Statement (I) : It is impossible to specify simultaneously with arbitrary precision, both the linear momentum and the position of a particle. Statement (II) : If the uncertainty in the measurement of position and uncertainty in measurement of momentum are equal for an electron, then the 1 uncertainty in the measurement of velocity is . In the light of the above statements, choose the m ⩾√hπ × 2 correct answer from the options given below : (1) Statement I is false but Statement II is true (2) Both Statement I and Statement II are false (3) Both Statement I and Statement II are true (4) Statement I is true but Statement II is false Q68.0.1 M solution of KI reacts with excess of H2SO4 and KIO3 solutions. According to equation 5I−+ IO−3 + 6H+ →3I2 + 3H2O Identify the correct statements : (A) 200 mL of KI solution reacts with 0.004 mol of KIO3 (B) 200 mL of KI solution reacts with 0.006 mol of H2SO4 (C) 0.5 L of KI solution produced 0.005 mol of I2 (D) Equivalent weight of KIO3 is equal to ( Molecular5 weight ) Choose the correct answer from the options given below : (1) (A) and (D) only (2) (C) and (D) only (3) (B) and (C) only (4) (A) and (B) only

Q67.Given below are two statements: involving lone pair of electrons on nitrogen. In the light of the above statements, choose the most appropriate answer from the options given below (1) Statement I is incorrect but Statement II is (2) Statement I is correct but Statement II is correct incorrect (3) Both Statement I and Statement II are correct (4) Both Statement I and Statement II are incorrect

Q67.The correct option with order of melting points of the pairs (Mn, Fe), (Tc, Ru) and (Re, Os) is : (1) Fe < Mn, Ru < Tc and Re < Os (2) Mn < Fe, Tc < Ru and Os < Re (3) Mn < Fe, Tc < Ru and Re < Os (4) Fe < Mn, Ru < Tc and Os < Re 2025 (29 Jan Shift 1) JEE Main Previous Year Paper

Q67. Choose the correct answer from the options given below : (1) (A)-(I), (B)-(IV), (C)-(III), (D)-(II) (2) (A)-(III), (B)-(II), (C)-(I), (D)-(IV) (3) (A)-(III), (B)-(IV), (C)-(I), (D)-(II) (4) (A)-(II), (B)-(III), (C)-(I), (D)-(IV)

Q67.Match the LIST-I with LIST-II Choose the correct answer from the options given below: (1) A-II, B-I, C-III, D-IV (2) A-II, B-III, C-I, D-IV (3) A-IV, B-I, C-III, D-II (4) A-IV, B-III, C-I, D-II

Q68.pH of water is 7 at 25∘C. If water is heated to 80∘C., it's pH will : (1) Decrease (2) H+ concentration increases, OH− concentration decreases (3) Remains the same (4) Increase 2025 (23 Jan Shift 2) JEE Main Previous Year Paper

Q68.Heat treatment of muscular pain involves radiation of wavelength of about 900 nm . Which spectral line of H atom is suitable for this? Given : Rydberg constant RH = 105 cm−1, h = 6.6 × 10−34 J s, c = 3 × 108 m/s ) (1) Balmer series, ∞→2 (2) Lyman series, ∞→1 (3) Paschen series, ∞→3 (4) Paschen series, 5 →3

Q68.Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15 K . If pressure of the system is increased 2 times, keeping temperature constant, then identify correct observation from following (1) Volume of system increases . (2) The solid phase (ice) disappears completely. (3) Liquid phase disappears completely. (4) The amount of ice decreases.

Q68.In which of the following complexes the CFSE, Δo will be equal to zero? (1) [Fe(en)3]Cl3 (2) K4 [Fe(CN)6] (3) [Fe(NH3)6]Br2 (4) K3 [Fe(SCN)6]

Q68.The large difference between the melting and boiling points of oxygen and sulphur may be explained on the basis of (1) Atomicity (2) Electron gain enthalpy (3) Electronegativity (4) Atomic size

Q68.Match the Compounds (List - I) with the appropriate Catalyst/Reagents (List - II) for their reduction into corresponding amines. Choose the correct answer from the options given below : (1) (A)-(II), (B)-(I), (C)-(III), (D)-(IV) (2) (A)-(III), (B)-(II), (C)-(IV), (D)-(I) (3) (A)-(II), (B)-(IV), (C)-(III), (D)-(I) (4) (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

Q68. Choose the correct answer from the options given below : (1) (A)-(IV), (B)-(III), (C)-(II), (D)-(I) (2) (A)-(III), (B)-(IV), (C)-(II), (D)-(I) (3) (A)-(III), (B)-(IV), (C)-(I), (D)-(II) (4) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Q68.For a Mg Mg2+(aq) Ag+(aq) Ag the correct Nernst Equation is : [Ag+] [Ag+]2 (1) (2) Ecell = Eocell −RT2 F ln [Mg2+] Ecell = Eocell + RT2 F ln [Mg2+] (3) [Ag+]2 (4) [Mg2+] cell −RT2 F ln [Ag+] Ecell = Eocell −RT2 F ln [Mg2+] Ecell = Eo

Q68.Identify the inorganic sulphides that are yellow in colour : (A) (NH4)2 S (B) Pbs (C) Cus (D) As2 S3 (E) As2 S5 Choose the correct answer from the options given below : (1) (A), (D) and (E) only (2) (D) and (E) only (3) (A) and (B) only (4) (A) and (C) only

Q69.Arrange the following solutions in order of their increasing boiling points. (i) 10−4M NaCl (ii) 10−4M Urea (iii) 10−3M NaCl (iv) 10−2M NaCl (1) (i) < (ii) < (iii) < (iv) (2) (iv) < (iii) < (i) < (ii) (3) (ii) < (i ) ≡(iii) < (iv) (4) (ii) < (i) < (iii) < (iv)

Q69.Identify the coordination complexes in which the central metal ion has d4 configuration. Choose the correct answer from the options given below : (1) (B), (C) and (D) only (2) (C) and (E) only (3) (B) and (D) only (4) (A), (B) and (E) only

Q69.The major product of the following reaction is : (1) 2-Phenylhepta-2,5-diene (2) 6-Phenylhepta-2,4-diene (3) 6-Phenylhepta-3,5-diene (4) 2-Phenylhepta-2,4-diene

Q69.Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature? (1) 30 mLCH3COOH and 30 mL NaOH (2) 45mLCH3COOHand25mLNaOH (3) 30 mL HCl and 30 mL NaOH (4) 50 mL HCl and 20 mL NaOH 2025 (24 Jan Shift 2) JEE Main Previous Year Paper Q70. 3 S( g) + O2( g) →SO3( g) + 2xkcal 2 The heat of formation of SO2( g) is given by : 1 SO2( g) + O2( g) →SO3( g) + ykcal 2 (1) x + ykcal (2) y −2xkcal (3) 2x y kcal (4) 2x + ykcal

Q69.Arrange the following compounds in increasing order of their dipole moment : HBr, H2 S, NF3 and CHCl3 (1) H2 S < HBr < NF3 < CHCl3 (2) NF3 < HBr < H2 S < CHCl3 (3) HBr < H2 S < NF3 < CHCl3 (4) CHCl3 < NF3 < HBr < H2 S